Just an observation...
Really nice by the way...
You all losing a lot of light at the bottom...
Those crates or slats you have them on appear to trap a whole lot of light that could be relecting on to the plant undersides.
Light is being eaten up in there.
Line those crates with foil like you did the walls or put everything on a white board.
Like I said, real nice, but why give away the light?
Good luck with your flowers...
